Matsya Purana — The Pushkara Manifestation
तया समाहितस्तत्र रेमे ब्रह्मा तपश्चरन् ततो जगाद त्रिपदां गायत्रीं वेदपूजिताम् //
tayā samāhitastatra reme brahmā tapaścaran tato jagāda tripadāṃ gāyatrīṃ vedapūjitām //
Absorbed in that (power/meditation) there, Brahmā delighted in deep austerity; then he uttered the three-footed Gāyatrī, revered and worshipped by the Vedas.
It highlights a creation-side principle: through Brahmā’s concentrated tapas, sacred sound (the Gāyatrī) is manifested/uttered, implying mantra as a foundational creative force rather than a pralaya event.
It models disciplined concentration (samādhi-like composure) and tapas as sources of right order; for householders and rulers, it supports the Matsya Purana ethic that governance and daily life should be anchored in Vedic reverence, mantra-recitation, and self-restraint.
Ritually, it foregrounds the Gāyatrī as a central Vedic mantra for sanctification and worship; while not a Vāstu rule, it underwrites temple/ritual practice where mantra (especially Gāyatrī) is employed for purification and consecratory intent.